Instances are accessed by clicking the gear icon 
in the upper right hand corner of the page and clicking on Instances.
Once on the Instances page, find the instance you want to delete and move your mouse over the instance to reveal the controls. Then click the delete button.
Once the delete button is pressed, you will be prompted to confirm your deletion. To finish deleting the instance, click the "Delete Instance" button.
Once deleted you will be given a confirmation that the target instance was deleted.
